Non-projectile motion. Projectile Motion
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1 Non-projectile motion *** Ex) A spacecraft has an initial component of v ix = +22 m/s and an acceleration component of a x = +24 m/s 2. In the y direction, the analogous quantities are viy = +14 m/s and a y = +12 m/s 2. After a time of 7.0 s, find the final velocity? x direction data x a x v x v ix t +24 m/s 2? +22 m/s 7 s y direction data y a y v y v iy t +12 m/s 2? +14 m/s 7 s Projectile Motion In absence of air resistance: v x = v ix a x = 0 a y = g = -9.8 m/s 2 Two types when v iy = 0 and when v iy 0 1
2 A car traveling with initial and final velocity of +10 m/s shoots a bullet straight up. With no air resistance, where does the bullet fall? Right Hand: lands in the exact position that it was shot from. Left Hand: lands back in the barrel of the gun Both Hands: lands somewhere between where it was shot and the car current position Ex) An airplane moving horizontally with a constant velocity of +115 m/s at an altitude of 1050 m. A package is released. Ignore air resistance, how long does it take the ground? y direction data y a y v y v iy t m -9.8 m/s 2 0? 2
3 Example continued At what velocity does the package collide with the earth? y direction data y a y v y v 0y t m -9.8 m/s 2? s v x θ v v y Max height A placekicker kicks a football at an angle of θ = 40.0 above horizontal axis. The initial speed of the ball is v 0 = 22 m/s. Ignore air resistance and find the maximum height that the ball attains. y =? V i = 22 m/s a y = -9.8 m/s 2 v y = 0 θ = v iy 3
4 The Range Find the range of the football kicked from the previous slide. t =? V iy = 14.1 m/s a y = -9.8 m/s 2 v y = 0 This is only the time up, the total time is 2.88 s A baseball player hits a home run, and the ball lands in the left-field seats, 7.5 m above the point at which the ball was hit. The ball lands with a velocity of 36 m/s at an angle of 28 below the horizontal. Ignoring air resistance, find the initial velocity with which the ball leaves the bat. 4
5 Name: Homework due 9/13/10 Hour: 1) A motorcycle daredevil is attempting to jump across as many buses as possible. The takeoff ramp makes an angle of 18.0 above the horizontal, and the landing ramp is identical to the takeoff ramp. The buses are parked side by side, and each bus is 2.74 m wide. The cyclist leaves the ramp with a speed of 33.5 m/s. What is the maximum number of buses over which the cyclist can jump? 2) A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 11 m/s at an angle of 65 above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed is zero. What is the vertical height between the two climbers? 3) A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 8.90 m/s and her body makes and angle of 75.0 with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude and direction. 4) Water from a garden hose that is pointed 25 above the horizontal lands directly on a sunbather lying on the ground 4.4 m away in the horizontal direction. If the hose is held 1.4 m above the ground, at what speed does the water leave the nozzle? 5) A soccer player kicks the ball toward a goal that is 29.0 m in front of him. The ball leaves his foot at a speed of 19.0 m/s and an angle of 32.0 above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 19.0 m/s.) 5
6 6) Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it is thrown as does the other. Find t he ratio of the height of the taller building to the height of the shorter building. 7) Suppose the water at the top of Niagara Falls has a horizontal speed of 2.7 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 75 angle below the horizontal? 8) On a spacecraft two engines fire for a time of 565 s. One gives the craft an acceleration in the x direction of a x = 5.10 m/s 2, while the other produces an acceleration in the y direction of a y = 7.30 m/s 2. At the end of the firing period, the craft has velocity components of v x =3775 m/s and v y = 4816 m/s. Find the magnitude and direction of the initial velocity. Express the direction as an angle with respect to the +x axis. 9) A volleyball is spiked so that it has an initial velocity of 15 m/s directed downward at an angle of 55 below the horizontal. What is the horizontal component of the ball s velocity when the opposing player fields the ball? 10) From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. The bullet puts a hole in a window of another building and hits the wall that faces the window. Using the data in the drawing, determine the distances D and H, which locate the point where the gun was fired. Assume that the bullet does not slow down as it passes through the window. H D 0.5 m 6.9 m 6
7 Picture on number 10 7
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